Changes

'''Pi''' or '''<big><math>\pi</math></big>''' or '''π''' is the name or symbol for an important mathematical constant, which appears in many branches of [[mathematics]]. '''π''' was originally defined in geometric terms as the ratio of the circumference of a circle to its diameter. A simple well-known formula using '''π''' gives the area of a [[circle]] as: '''π''' * radius * radius.

'''Pi''' or '''<big><math>\pi</math></big>''' or '''π''' is the name or symbol for an important mathematical constant, which appears in many branches of [[mathematics]]. '''π''' was originally defined in geometric terms as the ratio of the circumference of a circle to its diameter. A simple well-known formula using '''π''' gives the area of a [[circle]] as: '''π''' * radius * radius. <ref>{{cite web

An approximate value for '''π''' is 3.141592653... The exact value can never be expressed as a fraction or as a decimal number, regardless of how many digits are used (Lambert<ref>{{cite web

An approximate value for '''π''' is 3.141592653... The exact value can never be expressed as a fraction or as a decimal number, regardless of how many digits are used (Lambert<ref>{{cite web